UFO sighted by schoolteacher over Ireland

I was driving from Dublin to Wexford via Aughrim. The night was clear and calm. As I rounded a bend on the road I noticed lights flashing in the sky in the distance towards the south. I pulled over and got out of the car to watch. The lights seemed to be zig zagging across the sky and were coming nearer. Suddenly they seemed to merge and then I saw a large object with a very bright light shining from what seemed the rear. It was about half a mile away from me. There was no noise which immediately struck me as being very peculiar. The craft moved slowly up across a valley that was well under the level of the road and then disappeared out of sight.